Property 'allSettled' does not exist on type 'PromiseConstructor'.ts(2339)

I’m trying to use the Promise.allSettled API with TypeScript. Code here:


it('should partial success if QPS > 50', async () => {
  const requests: any[] = [];
  for (let i = 0; i < 51; i++) {
  await Promise.allSettled(requests);
  // ...

But TSC throws an error:

Property ‘allSettled’ does not exist on type ‘PromiseConstructor’.ts(2339)

I already added these values to the lib option in tsconfig.json:


  "compilerOptions": {
    /* Basic Options */
    "target": "ES2015" /* Specify ECMAScript target version: 'ES3' (default), 'ES5', 'ES2015', 'ES2016', 'ES2017','ES2018' or 'ESNEXT'. */,
    "module": "commonjs" /* Specify module code generation: 'none', 'commonjs', 'amd', 'system', 'umd', 'es2015', or 'ESNext'. */,
    "lib": [
   // ...

TypeScript version: "typescript": "^3.7.3"

So, how can I solve this? I know I can use an alternative module, but I am curious about working with TypeScript natively.

112 thoughts on “Property 'allSettled' does not exist on type 'PromiseConstructor'.ts(2339)”

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